Answer:
55.5000143456...
Step-by-step explanation:
Use the formula for the area of a circle and solve for r:

Answer:
C.
Step-by-step explanation:
Even if it is a piecewise function, we don't really need to approach it that way. Since both of the given equations have a slope, our only viable option is C because it is the only graph that shows the 2 slopes. All the other graphs show 1 slope and a 0 slope (horizontal line) so C. is our best choice.
No it isn't. You can determine if a point is by putting the coordinate values in for x and y.
(2)+2(1)=5
2+2=5
4≠5